LONG MEMORY PROCESSES (1 F(ALPHA) TYPE) IN HUMAN COORDINATION/

Consider the task of synchronizing the movement of one's limb to a per iodic environmental signal. Using rescaled range analysis and the spec tral maximum likelihood estimator, we establish that the experimental errors of human synchronization exhibit 1/f(alpha) type long memory wh ere alpha is about 0.5, and that the underlying stochastic process can be modeled by fractional Gaussian noise. In addition, we provide a pr eliminary model of this phenomenon using stochastic delayed differenti al equations.